I'm in the same boat and I would guess everyone goes through a burnout. It only took me a year and around 125 T206 in the collection. I then moved into a Lumley back run (that I just posted) to try and break things up. I would like to buy a few graded T206 a month but the discretionary income will not allow it so even if I can buy two a month, it will take me 17.5 years to complete the set.
With those number I should probably just come to the realization that it aint gonna happen and go ahead and start sharpening up my golf game for retirement.