Investing is crypto is already a risky business. Investing in mining is exponentiating that risk. IMHO, plain stupid. The major factor is, that the difficulty increases dramatically. Sometimes exponential. Most mining profitability calculators do not account for that. They give you the wrong picture, so you think mining is a good business (it is, for the one who is selling it to you).
See this calculator for example: http://www.mycryptobuddy.com/EthereumMiningCalculator
With accounting for difficulty increase the absolute maximum you can mine with 30 MH/s is around 3 ETH. But you have to run it for 2 full years (extend it to 24 months under the image) - and after that the contract will most likely be unprofitable to maintain. So, do you want to wait 2 years for your 3 ETH, with all the risk involved of the company saying goodbye or difficulty increase to beyond mars, or do you want them NOW safe?