The biggest reason MaidSafeCoin is relatively low is obviously that the SAFE Network hasn’t launched yet and it’s also quite difficult to find out what exactly SAFE is, how far along it is etc. The website just gives a few hints. It took a while after ethereum launched before the price started to increase a lot.
Ethereum has grown so huge because of two factors. One is the scaling problems of bitcoin and the multiyear stagnation in development making lots of people look for alternatives, where ethereum was the candidate that seemed most promising with a good team, good marketing etc. The other factor is all the ICOs. Ethereum is now the main ICO platform and there’s tons of interest in ICOs. Once the SAFE network is up and has an easy way of creating tokens, we may also see lots of ICOs on SAFE, in fact many of the ICO projects on ethereum would work equally well on SAFE (though most of the code would have to be rewritten).