sounds like the best thing to do would be to invest the $2500 into something you know a bit more about.
there is no determinate figure of money you can make on any given watch.
the market is what drives prices.
its like buying stocks... its all a gamble.
now, for us watch nuts, we do have a hand up cuz we have likely cycled thru quite
a few pieces so at least have a better idea as to what will at least not lose a lot
my suggestion is if you really want to buy a watch, do your 'own' research...
that way, if you don't get the payout that you so desire, it is only your own fault
and you can't put the blame on someone else.
good luck in whatever you decide.