You are right
BUT, hitting 30-50 casinos a week, wouldn't leave you many left after a couple of months.
No, it won't. I used to be able to get round this by hitting the monthly/periodic recurring bonuses. Though much less valuable than sign-up bonuses, there is a huge benefit in terms of reduced admin and bureaucracy in dealing with an operation that you know will pay you because they paid you before.
Unfortunately this isn't a viable option by itself anymore. Cryptologic bonuses have unilaterally vanished in the last month or so, which cuts out the possibility of making a living wage from this source alone.
Many people do everything, even crap operations like RTG with virtually 100% of cheating and/or at best stalled payment. This makes no sense at all to me.
BUT, hitting 30-50 casinos a week, wouldn't leave you many left after a couple of months.
This is a bit like asking "should I mark cards?". No, you probably shouldn't. If you get found out, which is quite probable, you will get blacklisted and you won't get a game anywhere. Their is a legitimate alternative, which is to train others and take a cut of profits, but its hard to persuade people to do this.
I notice a lot of people are getting into this stuff, but I'm sorry you are three years too late. You need to be looking at the next big thing.