If the local church is struggling with its finances (and its expenses are transparent and modest), AND the preacher has reason to believe a significant part of his congregation is leading a fairly lavish lifestyle - I would be perfectly happy with a preacher reminding his audience of their responsibilities.
Any local church that has a legitimate financial need for which its members are responsible may communicate so to its members. In reality however this call for more finances can be abused quickly if:
- the churches expenses are rising/substantial, but its members have no say over the budget
- the preacher is calling for more finances and he/she himself has a higher salary than the mean income of its member families (=credibility problems)
- the church needs more finances because its goal is to become BIGGER
Usually I find the call to give more to the Kingdom most credible and fruitful if it's call to give to OTHER Christian causes (but not the church itself). Because only this call is truly void of any self-interest.