This is not what we should argue about everyone has his or her way of belief and worship it most not be the church as a hole practicing it but you as an individual can also practice first fruit everyone has their reasons for carrying out any action a Christian can give up his or her first salary in order of sowing seed to God for an expectation maybe a job, child or anyother thing
Mate this is what is killing the church we believe that everyone should do what work for them, forgetting that the bible is the same and we ought to do things same as Christians. our God doesn't need you to give him your salary to bless you, he has already blessed you. I think poor teaching has really cause us as people. We must go back to preaching the cross messege, nothing like do what works for you, this statement make God look like a bias being. he loves everyone, nothing like giving him seed through your pastor for you to be blessed. its a scam message, supporting the church with your money is good for the gospel, but doing because you have God's blessing is foolishness.
January salary has nothig to do with your blessing or increase, if the year will be fruitful is all depend on your savings and appetite for your work. becuae many will give their salary and keep begging friends to feed, is that not foolishness?. We must stop the preaching of do what work for you, nothing like that in the body of christ.