There is no reason you can't keep doing it... so if you want to go through all the hassle and waste time and potentially get your coins stuck in unconfirmed transactions by messing about with low fee transactions and bitcoin accelerators to try and save your dust... Then go for it.
Thanks, I will do like this.
BTW with the BTC price constantly increasing, I think that micro trasactions (dust) will be always much more common than before. So someone has to find a solution (i'm sorry, I can't not. I'm a really new baby)