Basically mining is not going to make any one a fortune these days [...]
It was never supposed to. This whole concept of making big bucks is only an artifact of ASICS and is trending towards zero from the massive gains made by those with Avalon G1's and the lucky few who got Avalon B2's in Bitsyncom's "test" shipment. In 2012 I had an 8GH/s GPU farm which pulled ~5.5kW. This farm made me ~5BTC/day at its peak which was equivalent to $30 a day after power was paid for. We're almost back there (thankfully).
So far i have experience with S1, S2 and Neptune
S1 gave me ROI in BTC plus some cash (on resale)
S2 gave me ROI in BTC plus some cash (on resale)
Neptune gave me the same $$ on refund, but I used it to buy more BTC than I could have done in Dec because of the drop in BTC value
now I will have S2, S3, and spond's SP-30
we'll see