Absolutely not!
If you've already put your own money in, it can only help to show that you are committed to flying,
just make sure that you don't get too many hours - many airlines don't want to waste time unteaching bad habits. Believe me you'll get them when up enjoying yourself.
I understand that BA have a max in the region of 125hrs, but this depends on what you have been doing etc.
do it and it'll make you even more determined and you'll be on your way if BA doesn't come up.
best of luck
Quick