I can only conceive of two reasons for Rinnosuke to have a big sale: (a) he's planning a remodeling and this was cheaper than hiring Nitori for a proper demolition, or (b) he was given the idiot ball to set up this arc. Given that Life of Maid has never let itself be bound by common sense, (b) is the likely choice, but (a) or something like it would make a fine punchline too.
Income and expense diverged in a yellow ledger, And sorry I had to balance both And be one merchant, long I stood And thought as deep and far as I could On how I could make my shop see growth;
Then thought, hey, a sale was just and fair, Shoppers laying down their money to claim Everything from foodstuff to ladies' wear, Though as for where I got that there You have your secrets and I am the same,
And that morning with equanimity I lay For the event that would see me in the black. Oh, fliers marked the whole of Gensoukyou that day! Yet knowing how one purchase leads to another Dusting and tidying I my store I did bother.
I shall be telling this with a sigh Somewhere ages and ages hence: A dozen converged on the sale, and I, I saw the danmaku flying by, And that has made all the difference.