Well it`ll all about exposure to the largest market.
Beatport has the large market share, so they can throw their weight around.
If your label has commerical potential then getting onto beatport can be very helpful, but it isn`t the end of the world, and I`m not sure it`s worth getting pumped up the bum for.
I think for techno outside of the minimal genre it might not matter so much, cos the market is small enough where the enthusiasts will go looking for it rather than be lazy and just search one outlet.
I dunno, at one point I had my vinyl getting sold at HMV, which was great, but I`m not so sure how much it helped sales for the kinda techno I was doing.
The biggest outlet isn`t always the best.