They have a lot fewer costs to worry about as they don't have to pay for the facilities of a store. The manufacture's suggested retail price actually assumes you're a brick-and-mortar store so their cost includes the overhead of the store rent, utilities, the store employees etc.
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They don't have the expenses of an actual store
many e commerce site have its own store . its manufacture cost is very low. is this they get profit.
something is going wrong as their prices are too low and funded by it self .
Many products are sold below their actual MRP's , plus many sites offer free home delivery too . How can they make profits out of selling less and providing free courier services ? I am just curious .