Number of websites to promote

I wouldnt go to either extreme.

Here are two trains of thought

“Dont put all your eggs in one basket”:
An “off” month or policy change can be devastating to your budget. Many of us found this out the hard way when groupd decidied to exit the US market and we saw 5 figure monthly incomes plunge to 2 figures almost overnight.

“Dont Shotgun your visitors”
Putting up every casino you can find will overload your players and many of the newer non established programs will be rogue and this can damage your reputation with players permanantly. You also wont get paid by many new start ups who dont survive the first year.

I think a mix of proven performers with a good track record is the best approach. So my answer is somewhere in the middle of the two choices you suggested.