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Proxies for research sweeps
A finite job with a known end date. That changes what you should buy.
Scope it before you buy
Count the pages, estimate the traffic, and decide the window. Those three numbers determine everything else.
A sweep with no defined end is not research; it is monitoring, and it should be priced as such.
A single purchase usually wins
For a job that runs once, buying a set outright costs less than a month of rental. The maths flips once you run more often than weekly.
Traffic is where the surprise lives
The address count is easy to estimate. The traffic is the number that catches people out, especially when the collector pulls whole pages.
Keep the raw data
Store what you collected before you process it. A mistake in the analysis then costs you a recalculation and nothing more.
pages estimated up front traffic pages x average weight window fixed end date