It would be good if anybody can share here your harvesting experience. 10 000 XEM is needed (minimum) for the harvesting process, and now when XEM fell in price as all crypto - investing this or bigger amount can be good investment.
While supernode (3 mln XEM is needed) is very hard to afford.
It's totally hit and miss. You might get a few hundred on your first block or nothing for months. I wouldn't bother buying 10,000 with the expectation of making thousands more. It's a bonus for already holding coins, not the primary reason to buy them.