I'm working on an open source app that will allow checking sports bets for value

In order to gain experience of development in Meteor rapidly, I'm building two open source projects related to gambling. The first one will do what the title says. I have a plan mapped out for it and I've done more than 30% of the work. But I need to hear other people out: what checks do you want for your bets? I'm talking about the type of checks that would desconsider a bet in your eyes; I know from my own experience that sometimes it's hard to let go of them. But when you want to bet and the app will tell you "no" and offer valid reasons, maybe you'll actually listen. Here’s an example with the two most basic checks I can think about:

- First thing, to get it out of the way and not have the user influenced by the subsequent tasks, ask for a percentage based probability on how often will the event occur. For example: do you want to bet that Real Madrid will win instead of drawing or losing in their next match? How often do you think that would happen? 85%. OK, let’s go to step 2. - Input the odds, calculate the bookmaker margin, compare it with the averages for that event and so on. The checks will get more complicated as it goes on. I have a certain flow in mind.

The interface is beautiful and it allows for events with any number of outcomes and odds expressed in these formats: fractional, decimal and moneyline. For this reason it will also be helpful to people that bet on things like 1x2 and horse races, not just for handicappers.