Drunk Russians tip very well, apparently

I drift past another spot that's good for ride, McFadden's. I have never been in any of the nightclubs or bars where I usually pick up rides, and I know I never need to. I don't really like bars, and everyone is wasted and looking to hook up. Not my scene.
I stop in front and two drunk Russian men about my age run up to me. "Oh my god! Oh my god, this is so cool!" they shout.
"Would you like a ride?" I ask.
"How much to go around the block?"
"Five bucks?" I respond. They shout joyfully and jump in. As we round the corner, they cannot contain their excitement.
"Holy shit, this is the coolest thing ever! Holy crap! Do you want a drink?!" I look back at them and one is pointing his half full pint glass toward me. How the hell did they even get it out of the bar?
"Uh, no, thanks, I can't drink while I work."
"Fuck, this is the most incredible thing! We pay you double! We pay you twenty dollars!" I laugh and tell them, that for that, I'll take them around an extra block.
"Holy shit, we pay you triple!" They shout. I wonder if they mean it.
We finish riding around the block and they stumble out, giddy and cracking up. "How much do I owe you?" one asks.
"Well," I say "at one point you said you'd give me twenty bucks."
"Here you go!" he says, shoving a twenty into my hand "and here's a little extra!" He hands me a small wad of ones.
Behind me, another peddicabber from the other company, Leonard, pulls up. One of the men points at him excitedly. "Now we get in his cab! How much to go around the block three times!?"
"Uh, a hundred dollars," Leonard replies with an unenthusiastic shrug.
"Ok, we do it!" the men shout and clamor into the competition's bright orange cab.
"What!?" I shout, half joking "you're gonna pay him a hundred bucks!? No, get back in my cab!" But they've already pulled away.
I learn later that night that Leonard wasn't counting his money, but he was pretty sure the drunk Russians had payed him at least $200 to shuttle them around for an hour.