I was going over some older stuff regarding purchasing NEM stakes on NXT AE and I saw this reply from Utopian:
"You can buy as many as you want but a cap of 2 million NEM (2 tokens) will be put on each account converting back to NEM. Explanation: if one account buys 40 NEMstake tokens then this amount has to be broken in to 20 separate accounts during the conversion process in both sending tokens and receiving NEM back. This will increase the conversion cost and management cost and hopefully put a dampener in the desire to have a lot of NEMtoken.
(https://bitcointalksearch.org/topic/m.6971117)
What are those "conversion cost and management cost" and how high are they?
I guess he was talking about the tx fees for splitting and then merging everything.