In reply to oli1347:
A good, but maybe not cheap, climbing or mountaineering course will pay itself back a thousand times over in terms of freedom and independence it provides in the mountains. I'd very much see it as an investment in the long run.
Instead of cheap, maybe a better term would be value-for-money. I agree very much that very expensive doesn't necessarily mean very good but there is a middle ground where cost is quite a good indicator of quality.
I can't comment on the UK scene but in the Alps most weeklong courses will cost somewhere between 800-1200 euros. If you consider what you learn and what that amount of money buys you (huts, guides, food, sometimes also rental equipment and course materials) I think that's fairly good value for money.