I do believe there are enough biased wheels around but the problem is like you said todd, they can just change the wheels.
Get in, find a good wheel, use the best method for it as quickly as possible I guess.
The worst thing is when the table is very slow. I cant play like that and imagine collecting for bias.
If you play in a team you can occupy an empty table to blend in. as long as your partners dont take their time spreading chips but then you have to count their losses also