Let's look at Flick's pricing now in Christchurch:
Both FIXIE and EARNIE plans have kWh rates much higher than Genesis. You don't need to be a rocket scientist to see the price difference. Off-peak 12.13c/kWH Peak 29.20c/kWH (Low-User rates).
Again, you are not exactly comparing equivalent plans there. Flick's Earner plan (which is rather new, and not one I'd use personally) has built-in rewards so a direct comparison is out. For its Fixie plan, Flick states "no fixed-term contracts or exit fees" but for some reason you only quoted Genesis prices for a plan with a "12-month fixed-term plan" and "early termination charge of $150.00"
If we instead compare Fixie to the Genesis low-user plan with no fixed term, Genesis' peak rate per kWh is 21% higher than Flick. So even if one is only concerned about price - and I've mentioned before I have moral qualms about being a direct customer of a large gentailer, and Genesis in particular - the matter really is nowhere near as clear as you claim.
Edit to add: another benefit to consider - while Flick Fixie does not lock in the customer, it does lock in the price. I'm currently paying less on Fixie than the prices in the PDF you linked, and I will be until August. By then, I may decide to switch to Freestyle.
The early termination fee is negated by the $100 sign up credit. But you're missing the point. What would encourage existing Genesis customer to switch over to Flick? Please point out the 21% price difference because i'm seeing Fixie plan as 16.10c on the off peak and 29.612c on the peak rate. Oh, and you seem to missed their 10% prompt payment discount. This makes it to 10.917c with Genesis on the low user pricing which is considerably less.
The rewards in Flick's Earnie plan is a joke. They're complicating savings by adding 2L for every $100 you spend, what if you fuel up at NPD or have existing vouchers like at Pak N Save (which such offers can't be combined?). I would say for most people, they understand what a 10% payment discount is, that's pretty normal. But trying to sugar coat things with 2 hours of power here or there won't make most customers to leave. I may be wrong. I do see other retailers sending their marketing team knocking on my doors quite often and the reality is, they're trying to bait you over on a wee price difference. They quote the non-discounted rate of Genesis, or have other deceptive tricks to win you over. The issue for myself, i've been through the Flick experience before... no more having to check spot rate powers.. for which a fixed rate plan suits the household best (not every 30 minutes the price changes). But what's clear, the Fixie plan is a lot more than 10.917 - can you blame me or others in Christchurch?