Mid 70's baseball

For as long as I can remember the demand for vintage cards has been fairly high up to the 1972 set. Were the 73 and 74 sets that bad? Or just too plentiful? What are the best 70's sets after '72? What has changed during the 15 years I have been on the sidelines?
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*ahem* Anyway to answer your question. The 1970-1972 sets cost more mainly because in those years they did the cards in series (including the super scarce last series). This is especially true for 1971 as the black borders make it exceptionally difficult to find NRMT or better cards (raw or graded). The 1973 also came in series, but Topps as an experiment also released all the series together in some areas (which almost negated the scarcity of the hi number last series; ALMOST). Since that experiment apparently went well, Topps chose to do away with series starting with 1974, and would continue to release all of that year's cards as one series for the next 18 years. This meant that the cards were much more plentiful all around. The fact that 1974 had some factory sets made and that a TON of 1975 unopened material has been seen for many years also impacts the value. But that's good news for me because it makes getting 1973-75 sets at least a realistic possiblity.
D's: 50P,49S,45D+S,43D,41S,40D,39D+S,38D+S,37D+S,36S,35D+S,all 16-34's
Q's: 52S,47S,46S,40S,39S,38S,37D+S,36D+S,35D,34D,32D+S
74T: 241,435,610,654 97 Finest silver: 115,135,139,145,310
73T:31,55,61,62,63,64,65,66,67,68,80,152,165,189,213,235,237,257,341,344,377,379,390,422,433,453,480,497,545,554,563,580,606,613,630
95 Ultra GM Sets: Golden Prospects,HR Kings,On-Base Leaders,Power Plus,RBI Kings,Rising Stars
Thanks Estil for beating me to the punch.
D's: 50P,49S,45D+S,43D,41S,40D,39D+S,38D+S,37D+S,36S,35D+S,all 16-34's
Q's: 52S,47S,46S,40S,39S,38S,37D+S,36D+S,35D,34D,32D+S
74T: 241,435,610,654 97 Finest silver: 115,135,139,145,310
73T:31,55,61,62,63,64,65,66,67,68,80,152,165,189,213,235,237,257,341,344,377,379,390,422,433,453,480,497,545,554,563,580,606,613,630
95 Ultra GM Sets: Golden Prospects,HR Kings,On-Base Leaders,Power Plus,RBI Kings,Rising Stars