It may just be my taste buds, but I haven't been overwhelmed with the ELs. Several of them are good, even excellent cigars, but there are a lot of really great regular production cigars that are just as good or better, without the premium price. I know there is some prestige involved in having a limited production, but to me the end game is all about the flavor and enjoyment of the smoke.
If you're a collector with an eye towards aging for the purpose of reselling, then maybe the ELs are a good opportunity. But then again, Habanos makes not specific claims about limiting the productions, so you never know when they are going to release more of these, which could hurt long term investment prospects.
For me, cigars are for smoking and I simply don't have the patience or the space to age cigars beyond 3 or 4 years, and every cigar I buy is for my own personal enjoyment. If I was looking for an investment vehicle I would rather invest in stocks, Mutual Funds, real estate or treasuries.