Isn't the price very low on openex... What should be a stable price according to the max coins...?
It's impossible to say. The markets make no sense. This coin should go up because of the PoS and great specs. At 250 M EBT, it has a fairly high count, being more than 3 times the number of litecoins max. Also, it inflates very fast right now, with 50% mined at about 4.5 months if I recall correctly. That's good and bad. The bad part is that inflation will be high in the near term. But the decay is so fast, that after a couple of years, it will be negligible, even with PoS.
If the markets were rational, the value of the daily transaction volume (not trading volume) would determine the max market cap (the value of 1 coin times the max PoW coins). But if this were the case, then DOGE should be 12 - 15 times more expensive than it is.
For 2nd (cryptsy coins not on BTC-e) and 3rd (coins on exchanges not cryptsy) tier alt coins, hashes determine price, where 10x the hashes per second roughly equals 30x the price. Right now, EBT hashes at about 35 MH/s, which is respectable, but kind of low. One thing that the hashes don't show is the number of miners. For EBT it has been a constant 40-50 since about day 1, which is a lot. It suggests that this coin is favored by small-time miners, so will probably not command a premium price for some time. My suggestion is to mine it and hold it.
But with its good specs, this coin will survive a long time and only get stronger. Like CASH, EBT is a miner's coin and I've been mining nearly constantly since the first pool opened up.