Last I was involved with the market the wings were worth about 50k gems. Now I see they're worth 75k-100k gems. I used to sell at 1:500 and I think if you apply the same logic there it'll work. I'd do the total for you but I can't do that kind of math without help.
4 digit dragons are a bit harder to sell, partly because there's not a really 'set value' on them and the price can change on desirability (aka a number like someone's birth year say 1997 or 2004 will sell better than 5302, or a palindrome would sell better than a random number) Really the dragon is something you should try to sell on site for gems, then sell the gems here later on. They can be traced back to you a little too easily from here.