This is certainly a consideration. On he other hand, I figure I can replace my $150 rod 5 times out of my own pocket for the same price as an $800 rod with a lifetime warranty. And, if I break the same rod 5 times in my lifetime I need to get help! (Also, lifetime warranties are not free. The cost of replacement is built into the initial cost of the rod.)
Not picking fight here. To each his own. If warranty is a selling point for you, great. Just not much of a selling point for me.