In my opinion, owning a complete set makes you a sort of "voting member" for that set. I've made no secret of my belief that:
*The 1951 Topps set is the first real Topps baseball card set--not the 1952 Topps set.
*The 1951 Topps set consists of two series of 104 + 2 = 106 total cards--not two separate sets of 52.
*The 1951 Topps Series A set is greatly undervalued.
It's good to know that the Topps company now somewhat agrees with me, demonstrated by their release of this year's 2015 Topps Heritage '51 Collection consisting of 104 total cards. If I was interested in Heritage sets, I'd definitely be going after this one as it looks to be a really cool set. As it stands now, I'm more interested in Reprint sets than Heritage sets.
In terms of being undervalued, I've found that '51T Series A cards sell for well above book value. In fact, I haven't been able to find Series A cards priced according to the book values. I would propose that Beckett consider revising their listings of 1951 Topps Series A accordingly:
Commons = $20.00
Minor Stars = $25.00
Semi-Stars = $30.00
I think the above pricing more accurately reflects the market for '51T series A. Also, I would like to see Beckett combine their listings for the 1951 Topps set numbered from A1 to B52. The cards clearly say series A or series B on them.