Is the twig ladder thing the ramp? Looks too steep from this angle, try putting some cinder blocks under the bottom of it to elevate it and reduce the angle. The chickens might be willing to fly up to the platform to get in instead.
$30 for barnyard mutts seems steep but are these point of lay pullets, or already laying hens? If they're being sold as laying hens, did the ad specify how old they were? Also, not saying you should be distrustful, but do you know how to tell girls from the boys... I've seen some posts on here where people went to buy hens and the seller offloaded a bunch of roosters on them.
Past that I'd be looking at is how well kept and healthy are the birds. If the facility is a mess, birds look lethargic or filthy, etc. don't do it. Do NOT take birds that you feel sorry for.