Nope, because its quite rare for toys to accidentally take off like this. If you 'always do your best work no matter if you think it's a just a toy or if you actually want to sell it' you'll just waste loads of time polishing things that no-one will ever see.
Survivorship bias. There's probably a million developers out there who poured their heart and soul into their game, only to have it languish with single-digit sales figures.
