This is wrong. Merit aren't meant to be exchange between users, sure you can send a user that merited you merits for a quality post he made (backscratching) but sending him/her merit for low quality posts just because he/she merited you can be considered as merit abuse which is frown at my DT members. You're free to give merit to who ever you want but  that shouldn't mean you should abuse the system.

Merits are to be given to quality posts not exchange for worthless posts