Of course Lett has the right to have a watch and rings. They can be any price if he's paid for them or someone has gifted them to him.
The point is about appearance.
The GB live in an ivory tower where their needs are taken care of by others. They supposedly live on the same stipend as the rest of the Bethel family.
With that in mind, it's at the very least, in poor taste to appear on a worldwide broadcast going out to many millions of people, many living in very poor circumstances, wearing the trappings of material success and repeatedly beg for contributions.
People can be pragmatic about the first class world wide travel, luxury accommodation, exclusive trips provided by wealthy brothers and so on. Most of this people do not see first hand. It really starts to grate and breed resentment when it's pushed in peoples' faces over JWB whilst begging for more greenbacks over and over again.
The evidence for watches being expensive models has been presented many times here and elsewhere.