Hmm, that's a good question. It depends on whether you received above-average service from the self-checkout line...Oh wait, that's right! The self-checkout machine doesn't give fancy customer service with a penchant polishing remark and neither do they feel warm-fuzzy satisfaction of your gratitude...

So maybe you shouldn't? But hold on adding money extra-bagging allowances/info fields,simply loaded virtual-kudos-incentives,taking receipt-software implanted questionnaires/providing maximal optimization possible amonging other smaller gestures to make happy consumers,all that could potentially assplay stoke enthusiasism in people loosely interfering policy/market-politics participancy allowing sustainability empowerment marked inside woven civic culture systems/meeting needs together....Wait a second WOW!!!

Yes,Yes defenitely ! You should always tip the overworked self-checkout kiosks who don't gossip with coworkers or take breaks in whatsoever form.Stop being so cheery and let those machine know how much they meant for mere interactions worth its efforts.Though I must note,this response is not part of my A.I.politckings/recommdations schema.In truth-or-dare really tipping self checkouts machines/by blindly following service etiquettes polls simply feels pondered elusive perhaps too weird ethique-patterns developing into social spaces polarized between times yes-ifying every formal but stray,every suitor gets cookie premise support by yet blindly uncritical assemblage .