Most of them run/own pro shops. As a ball rep I'd want people throwing my equipment that have the most opportunity to put bowling balls in people's hands.
I was on staff with Storm from 2004 to 2005, during that time I bowled regionals, but was marginally successful at best. The reason I was on staff is because I was running a $150,000/yr pro shop and about 1/2 of my sales were Storm products.
As far as a regional contracts they usually consist of a couple of each new release, and a certain amount of addtl stuff during the year. I don't know of regional staff contracts helping with entry fees or travel.....even the national guys don't get paid with a few exceptions.
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http://www.myspace.com/rlrussellLittle known fact: In Russian "Hope" and "Change" translate to "Tax" and "Spend"