[Curmudgeon]

The 1000 persons, 100 x starting wealth and annual budget of 50 x average income won't necessarily tell you all you want to know as there are likely other factors that are just as important to effectiveness. That said, it does set some upper limits on what can be done.
100 x starting wealth in an organization of 1000 people can be interpreted in several different ways. It might mean an organization that has a base that can hold half the organization at one time that would be equivalent to a poor person's home (a soup kitchen or tenement). It might mean a base equipped for 200 people at the equivalent of a stuggling individual (equivalent to a YMCA), an average base for 100 people (an apartment complex), a comfortable base for 50 people (a typical social lodge such as the Freemasons), a wealthy base for 20 people (U.N.C.L.E. HQ), a very wealthy base for five people (MacGyver's Phoenix Foundation) or a filthy rich base for a single individual (everybody meets or reports at the home of the wealthiest member of the organization). While I've phrased it in terms of housing, this would represent not only the buildings but the other resources as well, such as vehicles, treasury, weapons, special equipment (surveillance), access to false IDs, etc. The number of people a base can accomodate at a given wealth level should represent the usual numbers of persons found there. It might vary by up to a maximum of 300% of capacity (a very crowded meeting to initiate an operation) and might be as low as 25% (most people have been called away; whether to attend a holiday, perform some non-organization task or attend to organization business occurring away from the base). Except for very small bases, the term base should not necessarily be taken as meaning a single location. A base might represent a main base, several safe houses, a number of small meeting places scattered throughout the city as well as equipment caches.
An annual budget of 50 times average income also implies a few things about the organization. First, if it has any dedicated full-time agents, it is limited to no more than fifty of them.
Almost everyone in the organization has to hold down a day job. Most organization work will have to be conducted during free-time or sleep-time. How much free-time/sleep-time any member will be willing to contribute will depend on the dedication of the members to the cause. As a generality, only an organization made up of fanatics should expect to be able to have a 100% turn-out at any time of the day or night for as long as a mission takes.
It's fair to assume that most members of an organization would be willing to devote no less than a quarter of their free time and no more than half their free time to the cause. The amount that a given person would donate within that range could be based on the degree of that individual's dedication to the cause.
This time can be allocated as desired, less frequent calls to attend to the cause's needs should result in individuals being available for longer periods. Assuming six hours of free-time a day and strong devotion to the cause, a member who is required to serve daily would only be willing to commit three hours to the cause at a time; the same individual called on only once a month might be willing to spend eight hours a night for almost two weeks doing location surveillance for the cause.
Back to our dedicated agents for the moment. Payroll probably shouldn't consume more than half the budget, the other half being spent on other operational expenses plus maintenance. In this case, we might have twenty-five full-time agents of the conspiracy. Having a greater number of agents at some times during the year means having fewer agents at other times or else it eats into the operations budget which limits what the agents can afford to do. The number of operations the organization can carry out depends on the number of agents that are required and the length they are required for. If all the agents are required for a month to mount an operation against a rival city-state, there are no other operations occurring that month. If a given operation only needs five agents for two weeks, the organization could mount ten such operations in any given month.
The next post will look at some of the other factors that might be at work.