I paid a $1,000 for heavily buffed and reblued 1900 in the 10k range 3 or 4 years ago; I would say value would be slightly less now.
The price you paid is about what they go for, saying that, commercial guns sell less than say a military.
I have a couple of 1900's for sale at
Legacy Collectables, to include a very nice Test Luger and although there is interest, they just don't sell like say a 1941 byf....
Ed