The whole point of options is to not have to offer above-market-rate salaries to attract great talent to infant startups.
However I agree founders should be up front about the financial/investor makeup of the company.
I assume that the options are intended for people that are bad at math.
It does appear to be a way to get employees for cheaper than market rates by taking advantage of an arbitrage in employee lack of understand of the financial and legal issues concerning stocks.