Revshare Sponsors w/ "Processing" Fees

[Windy City]

I saw this mentioned inside another thread and it's been something that has been bothering me for a little while. I won't name company names, but I think it's kind of sleazy to be pulling out huge amounts of money for processing in a revshare program. Now I'm not talking about a couple percent, I'm talking in upwards of 15%. Now these aren't small time programs either with only a few sales to process a day, these are large programs being pushed heavily.

So I guess I have a multiple part question here.

1) Should sponsors be taking this money out of your sales? When I read 50/50, I'm assuming that I'm getting 50% of the sale amount. Most programs don't take out for processing.

2) Should programs disclose up front what their processing fees are? It's a bit frusterating to sign up for a 60% revshare program and end up making 44% when fees are deducted. I think it's a tad misleading. If I sign up for a $30 PPS program and they pay me $27 for each payout because of processing, I think we'd have some pissed off webmasters.

3) How the hell do you get that high of a processing fee? Mind you I've never processed in adult, but 15% seems awfully high for anything. Is this normal? If not, are these companies juicing the numbers?