"with the license you get 10" Questioner didn't stipulate the license they were on. The SF folks I deal with have enterprise licenses (200 custom objects) because SF supports a core part of the enterprise (the revenue side of things). With that there's a certain set of norms that happen and my suggestion is a simple approach to the problem.

"Pay appropriately and do it the right way"

If you're looking for the cheapest solution or the "just getting by" solution don't use Salesforce or you'll get some nasty surprises.