Likewise a BAEC member for getting close to 18 years now. Had various upgrades from WTP to Club, twice from Club to First, one or two from ET to CE. Though I feel I have fared reasonably well, the reality on examination is that it was around 2-3% overall.
As so many have stated before, you gets what you pays for... if you get an upgrade then it is nice.... but do not expect it... because you will be 97% disappointed!