I am no mechanic but I can offer my experience as a snooker table owner.
You have the size of 5 x 10 working against you. Most home owners have barely enough room for a 4 1/2 x 9 hence all of the tournament 8's sold as well as regular 8 footers. Now looking at it the other way round if you can fit a 5 x 10 (I did) you can probably make a 6 x 12 work (that is what I have) and that is what a serious player wants. (I am not serious but is a greater challenge than a 5 x 10).
So you are in a quandry - too big and too small. Couple that with the popularity of snooker (lack of) and you have a tough sell. Eight ball and other games are great on a 5 x 10 but most often the larger pockets and smaller table are what people want to play on.
I paid $1,100 for a Centennial snooker table, went 600 miles to get it and paid for recover and set up by professionals and soon tired of the size having always wanted a 6 x 12.
I doubt you will get more than $500 for your 5 x 10 GC but you may be lucky and find a player that wnts that size as a 5 x 10 GC would be the second choice after a Centennial or Anniversary.