The rates are usually higher, most don't care to remake retail. Private servers are usually high rate because people prefer to just use them to have a bit of quick fun with PK battles where they can pick and pimp any class they want in a few days.. and sometimes end up staying.
There are low rate P-Servers as well, depending what you like.. the best place to start is just look at this thread by c1ph3r:
Last but not least, in case you were unaware, the x in the rates means times. Ex. 10x is 10 times the amount of what retail currently uses.