Euler wrote:my contact list is overflowing with successful exchange participants.
I don't doubt that. However, I do doubt whether that's representative.
It doesn't appear to be possible to set up a poll in the forum, but if it were, I would ask the following question:
'Over the past 12 months, have you made an overall profit on Betfair?'
I would imagine that the overwhelming response would be 'No', even though there are likely to be a higher proportion of successful Betfair users on the forum than in the general Betfair punter/trader population.
As for my own 'negative mindset', the fact that I am still posting here tells you I haven't given up.

In fact, I am finally beginning to see the light. Watch this space!
However, being positive doesn't mean being blinded to harsh realities of trading, one of which is that it's a zero sum game where the few feed off of the many.
Jeff