For me, there are 2nd shooters, and there are folks that want to tag along to learn about shooting weddings.
I offer a second shooter as an add-on to my existing packages. When clients purchase the add-on, I need to make sure I can provide someone who can get all of the shots for their "assignment" without me being there. Typically the 2nd shooter is covering the groom's prep, while I am covering the bridal prep. This means I need to hire a 2nd shooter that I can trust to deliver the goods. I pay more than most around here to make sure I can get an experienced wedding shooter as a 2nd.
For someone who is looking to learn about shooting a wedding, I'm more than happy to let them tag along, shoot with their gear, show them a few tricks that I've learned (as time allows) and use the images they capture in their portfolios. I do not send tag-a-long shooters off to capture something I have to deliver to clients. Since people are gaining experience at my paid event, and perhaps learning a few things from me, I'd consider the experience appropriate compensation. There are many wedding photographers out there that I would gladly carry bags for, just to get a glimpse of how they work, and consider myself well compensated.
Either way, I could care less about what gear a person brings. We all know that a bag full of L glass does not necessarily make someone a good photographer...any more than owning a Porsche makes someone a good driver
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The thing is, with the economy the way it is, I can put an ad out on a local wedding board, and have my pick of very experienced 2nd shooters. I'm not going to pay someone to learn at my expense. So my advice would be to find photographers in your area whose work you really admire, and offer to carry their bags a couple of weddings to get a bit of experience. Once you have some solid experience under your belt, you might have better luck getting paid gigs.