It might sound expensive and doesn't worth at all if you did subscribe to any data plan every month. But there is some people out there just use their phone to make few calls per month and doesn't subscribe to any monthly data plan. So for them extend validity is more worth it than keep reloading their number every month just to keep it active. For me RM50 for 2 years consider quite reasonable already as for example like Digi extend one year of validity can cost up to RM108 per year which is like RM9 per month compared to Xpax which only cost around RM2 per month.