Here's an interesting article on the whole exit "discount" strategy...
MarketingSherpa: Automated Chat Saves Abandoned Shopping Carts: 5 Simple Steps to Get 10% Lift
My contention is not discounting per se, it's discounting without a reason why, or without some form of trade-off, so that the discount doesn't appear "out of the blue" or just because the visitor is leaving.
I believe it's better to offer a downsell, a last-minute bonus/incentive, or at the very least give a good reason why you are offering a discount -- either make it a sale, or tie it with a promotion, or tie it with something other than the simple fact they're leaving.
The problem is not so much the lost of a sale (discounts DO increase sales), but you're:
1) Educating people not to buy at regular prices;
2) Sell on price alone, without knowing that price was the procrastinating point in the first place;
3) Create distrust and resentment, albeit indirectly and unconsciously, since you offer it only because they were leaving;
4) Poorly qualify customers because you generate customers who only buy because of thee discount;
4) And negate the lifetime customer value because you create customers who, since they only buy because of a mere discount, would be less inclined to buy backend (and higher priced) sales. (Either that or you now have to work twice as hard to establish value, trust, and a relationship with the customer.)
Again, I'm not saying discounting is bad. It's tremendously powerful. Money is a common currency, like the weather. When a product is priced at, say, $97, it's $97 for everyone. But the objection, the value behind the price, and the quality of the prospect are all subjective.
(Just like 97 degrees F -- or 30 degrees C -- is the same for everyone. But "hot" and "cold" is subjective and relative, just like the value behind the price -- as well as the objection behind not buying a product or behind abandoning a shopping cart).
Price is the lowest common denominator. So if you compete on price alone, naturally the lowest price wins. However, you run the risk of the points mentioned earlier.
(The biggest one, to me, is that if you offer backend sales, your customer who bought on price alone will tend to leave you at the drop of a hat if what you sell if offered elsewhere at a lower price.)
But if you compete on the offer -- the benefits/value behind the price, the value-adds, the extra incentives, the bonuses, the downsell/alternatives, the payment plans, the options, etc -- and focus on the relationship with your customer, the quality of your customer (and his/her lifetime value) will increase substantially.
(Or at the very least, the less amount of work you will have to put into in the future to keep your customer, or to get your customer to buy more from you.)
My 3 cents.