People who used more than the average GWEI got rejected as well. I disagree with the way the ICO was handled. The system is not dependent on the blokchain. It would have been preferable to set up a queue and cap the maximum investment to mitigate the influx and give more people a chance. The technology does not account either for the small time frame in which people could invest which inherently cut many people off from participating. You are focusing on a very specific portion of a broader picture.
I used a Gas limit of 300000 and 60 Gwei and it went through fine so I don't think that was the reason it was rejected. This was the most comfortable and least stressful of all the recent ICOs, it took me a minute instead of hours.