It depends on a bunch of variables....
The idea of basing is on loan amounts or 1% of loan amount is a bit antiquated. Its more like any negotiable, non-tangible service. What is your cost? What is the margin you need to maintain? How much can they afford? When you utilize a busines model including these variables, then you come to an acceptable fee.
But, that is all hypothetical In real life terms, I see anywhere from $1,995 to $3k coming my way. But, most are around $2,500. (keep in mind our base fee for processing is $1,200)