On-premise ERPs are considered a capital expenditure since they require a high up-front cost. On the flipside, Cloud ERPs are considered operational costs as they are usually priced on a subscription basis. Although Cloud solutions have a lower initial investment, it is a higher long-term cost. But this is an acceptable opportunity cost for businesses due to the minimum capital expenditure.
SMEs, on the other hand, may see Cloud ERPs as a lower cost in the long term too, because there is not enough volume to efficiently spread the fixed infrastructure costs that come with on-premise ERPs. It enables such businesses to implement a complete solution without a large initial investment.