I guess Onio has to put WAY way more ecchi scenes and lucky incidents to appease the Japanese audience. Maybe even a harem? Maybe the group in his manga is just way too small? Most of the manga I liked and had been successful in Japan, that didn't have lot's of ecchi either were action-oriented, comedy 4-koma or had a big group of friends/club members working towards a similar goal (some sort of inter-high tournament for example).