How to spend points from Partiko?

Other than gambling them in their sports betting games, there is no way to spend them at the moment.
However, this will change in the future when you will be able to use them to buy upvotes and greater visibility for your posts amongst other things.
My theory is that they will really come into their own when Steem finishes introducing SMTs. The points could become a whole new Partiko 'currency' which would be really cool.
Until that day arrives, Id suggest keep using @partiko to collect points as it really is such an excellent, stable and quick interface to the Steem blockchain and with no doubt, many new features being added as it develops and builds it's userbase.
I hope this helps :-)