This whole manga is retarded
IF he's giving PERCENTAGE buffs then his team's BASE STATS would still be have to be pretty high and his items would be worthless for a civilian princess no mater how high rank they were.
These brainlet nips, despite being from the land of 200h rpgs that need a minmax chart to beat, never properly think through their stories
Edit: It's still a good read, though. You just have to ignore the usual LN retardation
Also this man takes the "spineless mc" to a whole new level
He gets used and literaly abused by every single person he meets. The guild was ripping him off, the inn lady was a cunt despite knowing him for god knows how long, his custumers are all pratically robbing him.
Everyone except pumpkin head bro who took pitty on the poor autist and did him a solid.
inb4 I'm giving him a autist diagnostic, not using autist as an insult. My qualifications: Somedudeontheinternet University