First thing it need so I can worship him/she is I must feel he/she is morally better than me if not in all virtues at least in one.
Also really important that I feel my worship will be taken with love/respect/appreciation.
Generaly I do expect something in return of the worship, almost always I expect the deity to help me develop global or specific virtue and also sometimes something specifical and more material/psychological I may want in my life.("I need money" "I wan´t to be happy in this area" "Please help my friend with his feelings" etc)
If the deity is just powerful but not moraly superior, I may prefer not to worship him/her, because of not being interested or because of fear
. The way I see it, no deity should make me problems for "not worshiping" if I didn´t had a close relationship with him/her or offended him/her in the first place, so it´s better to just worship morally superior beings that are mostly beyond ego, and will be compassionate with me if I *** up in ay case.
May do ecceptions with the non-morally superior stuff but would be more like "pay respects" I don´t think I would call it worship. It is just a general different feeling and I just very rarely have done such ecception, and it has been rarely something major for me the respects or the request anyways.
So there. I would NEVER worship because of fear. IMO a deity that wants to be worshipped shouldn´t fear you into it unless to the very least it had a relationship with you and you ***ed up.