All what we are doing in the form of ibadat is only for Allah s.w.t. When we ask for help from Masumeen a.s. it does not mean that they do these things for us by themselves, rather its the power blessed on them to perform these actions or we pray to Allah through their tawasul as Allah s.w.t. blesses those prayers which have tawasul of Ahl e Bait a.s