It will change nothing, except price of merit at black market. And you will se more shit threads and "gimme gimme one, pleaaasee".
Don't worry, buying and trading merit will not be possible in the near future. Most users will run out completely from merit in the next few months and only sources will be able to send it.
People sending more than 10 smerit to their folks for posts containing "hohoho i am a stupid illiterate spammer" are not trustworthy and should receive a negative trust even that theymos isn't totally agree with it...