Don't bother.

Unless you are going during a trade fair or visiting Moscow, you won't have any issues getting a decent hotel at a decent rate. If you earn loads of points through your normal travel and you want to use them or if you are looking to stay in presidential suites, then go ahead...But actively investing time, money and effort to get points to spend on nights that would cost you under 100 Euros in a 4-star hotel is a false economy IMHO.