Hey Faiza, the reason we limit our parlays to 4 options is so that we can effectively manage our risk, while still delivering a great user experience. If we were allow a user to make a 7 option parlay with odds of 400:1 we would either have to limit the amount they can risk to something very small, or accept the chance of losing a very large amount. Running our book responsibly is of the utmost importance, and we are committed to delivering a great experience with every functionality we offer, so we decided to keep the parlays at a manageable max of 4 options.
With that said, we are considering increasing to 5 options, and I will definitely pass along your feedback.
cheers