I don't think there's a problem with doing this at the same time, bet small, aim for a huge parlay, and take it slow and steady. Why not try both of them? If you are lucky to hit $2 with a parlay of x5000 odds you can then cash out this $10,000, but if it's bad luck, then at least you tried while you win some by taking it slow and steady. Since your chances of winning at very high odds in parlay are very slim, I stay consistent in betting without high odds in parlay because the chances of winning are high, but aiming to hit $10,000 is impossible.