This works pretty fast and the shards average in about 3-5 per run for me.(is that a lot or a little compared to the rest of you guys)
Depends how long the run takes really, if it takes forever then the amount you get isn't really impressive. A farm's efficiency is usually judged by k/hour, and worthwhile farms are about/at least 10k/hr.
Then his would qualify as obby's are worth 2.5k each and I doubt he is taking more than an hour for this run. Seriously, if your farmin with a sin, farm ectos and sell them to buy shards from other classes that can't farm the ectos.