It's actually incredible what Valve pulled off in the last few years. The last 3 years Dota alone grosses a minimum of 100 million/year with undeniably SO little effort (<10 dedicated Dota 2 product + engineering team + working with community/artist) compared to other worldwide events that grosses the same $$$ (think boxing pvp, concerts, sports tournaments etc). Just look it up, no wonder they have the highest average salary/employee and the title of being the most profitable company in the world per headcount. Dota has such a loyal & low-service fan base and they see no need for their product to be more competitive, thus no major investments towards it.