As long as the bike does what you need it to don't worry.
The gains against spend become more and more marginal the more you spend. A £7000 bike is not going to be 7 times better than a £1000 bike. It is likely to be quite a bit better, but the biggest factor is the rider. If someone has the money to by a high end bike then that is fine, the most important part imho is to enjoy riding, whatever the cost of your bike.
Well said.