People benefit from speaking to Allah the Exalted during Ramadan
People benefit from speaking to Allah the Exalted, being addressed by Him, praying to Him and opening up their hearts to Him. They do these by reading the prayers of the month of Ramadan. Reading the Abu Hamza al-Thumali dua and the duas that one reads during the days, nights and early mornings of Ramadan are actually a kind of speaking to God, making requests from God and getting close to God. These people benefit from these things too. Therefore, they benefit from all the blessings of this celebration.
Avoiding sins is of higher priority and, perhaps, it is more important than these duas in some ways. These people do not commit sin in this month either. In the same sermon which was delivered by the Holy Prophet (s.w.a.), the Commander of the Faithful (a.s.) asks the Holy Prophet (s.w.a.) which act is the most blessed act. The Holy Prophet (s.w.a.) answers, "Avoiding sins". Avoiding sins is of higher priority than Islamic obligations. It prevents one's heart and soul from corruption.