One solution to the three-dipping on tortilla chips (I'll give you two dips, but not three--that's almost spit-sharing time) is to buy the smaller round chips. That's a one dip chip for salsa or ccq. I will double dip potato chips if it's my own personal dip at home, but I do not want to risk the complete social humiliation of having someone publically announce that I have committed a social faux pas by double dipping at a gathering. The person who would be doing the announcement would be my #4 sister, the former cheerleader whose voice carries far and wide.
Besides if you are at a party and reaching in a bag or bowl for a chip they are already contaminated.
You have no idea where the hands that went in that container have been.