If a gambler has a target of using $1k to win $10k in a year which is about 12 months, he will split the amount within the 12 months but it doesn't mean he must win in each of the months. Perhaps, if a gambler keeps $1k to gamble for a whole year then he shouldn't have a winning amount target at all, what he should do is to see that amount as what he can lose and not get affected in anyway, if he is able to make profits at the end of the year with the allocated bankroll for gambling then it's fine otherwise he should just forget about making a target from it because it is probably not going to happen that way.
It may happen, and it may not happen, don't forget that with just 10x win with a $1000 bet, the target of $10,000 is already achieved very easily and without stress, but like they commonly say that, things like this are easier said or imagined than done.
I do not see any reason why setting a target is bad, this is like a quest if you ask me, and without setting that target, it won't be fun at all, it's like a challenge.
My only concern is that, who ever is trying to challenge them self like this should make sure that they amount of money they are using is one they can comfortably loose and don't panic over it, $1000 can be a small amount of money for some people, but it's sure a really big amount of money for alot of people out there too.