Whether it is lawful to grant spiritual things in return for an equivalent of service, or for an oral remuneration?

Objections

Objection 1 : It would seem that it is lawful to grant spiritual things in return for an equivalent of service, or an oral remuneration. Gregory says (Regist. iii, ep. 18): "It is right that those who serve the interests of the Church should be rewarded." Now an equivalent of service denotes serving the interests of the Church. Therefore it seems lawful to confer ecclesiastical benefices for services received.
Objection 2 : Further, to confer an ecclesiastical benefice for service received seems to indicate a carnal intention, no less than to do so on account of kinship. Yet the latter seemingly is not simoniacal since it implies no buying or selling. Therefore neither is the former simoniacal.
Objection 3 : Further, that which is done only at another's request would seem to be done gratis: so that apparently it does not involve simony, which consists in buying or selling. Now oral remuneration denotes the conferring of an ecclesiastical benefice at some person's request. Therefore this is not simoniacal.
Objection 4 : Further, hypocrites perform spiritual deeds in order that they may receive human praise, which seems to imply oral remuneration: and yet hypocrites are not said to be guilty of simony. Therefore oral remuneration does not entail simony.