To be honest I do not see a PR problem, neither do I see a 2-tier customer base ... Yes the Alpha peep's (IMO) are lucky sod's for being able to test now ... If I had a spare £100 I would be right in there with them .. maybe even getting a little bored with the content because of the length of the Alpha and reported lack of content .. would I then suddenly be more informed than before .. No, I don't think so ... The Alpha backers have no clue when Beta starts ... and i suppose FD don't either (although I hope they have some clue)
To be honest, testing ED alpha can be very taxing and frustrating as hell. Because, well, it's actual alpha, not glorified prototype we see in Early Access games. Thus it require patience and cool head to report on findings, go in, test it, crash it, got griefed, start from Sidewinder again...
I really don't get these "ohhh where's my beta" tunes...believe me, it's coming, and when it will arrive, it will be a much better game than we have it at the moment (and atm we already have lot of really beautiful things, but they are neither fluid, nor stable).