Philb
I can well understand your thoughts here.
I too enjoy going through large mixes of stamps. On different occasions I have been given different offers to buy collections outright and the owners will say, if you take the whol lot and caboodle, I'll give you a special price for everything. Usually, I end up taking everything.
Just recently (August of 2010 actually), I purchased 2 plastic tubs of stamps off paper and there was an estimated 225,000 to 250,000 stamps in these bins. I 'sifted' through these bins on numerous occasions and each time I did, I kept finding goodies for my collection. I bought the 2 tubs for $350.00 total, and yes, that included the 2 tubs themselves

and I have literally found hundreds and hundreds of stamps over $1.00 to $5.00 CV not to mention many many stamps up to $25.00 and even higher on occasion. So, the real secret is, if you want to take the time, you will be rewarded for it as a rule. Without exxaggerating, I believe the CV of the stamps I could use was well over $8000.00! This does not count what is left in the bins either, although, to be honest, I probably got the best out of them now, but, you never know what you passed, especially with so many stamps.
I now have great trading power with my local club and people I have traded overseas with as well.
I guess this is what part of this hobby is really what it is all about
Chimo
Bujutsu