20.2% of users cite security concerns as the main reason they don’t buy from mobile ecommerce sites

This is a clear indicator of why UX is important for business. Other common reasons for mCommerce websites fail to convert include not being able to see product details, navigation problems, not being able to browse multiple screens for comparison purposes, and difficulties with data input.

Source:
https://www.webalive.com.au/web-design-statistics/