No, nor is there any need for "top athletes" to do so
good nutrition is good nutrition whatever form it comes in - be it the humble bag of jelly babies or an overpriced, over-marketed packet of shot blocks.
Why do top athletes use these things ?
Becuse they are paid to do so to assist the marketing of overpriced pseudo-scientifically justified products.
example
I once examined the nutritional information on a carton of post race energy sports drink It was from Boots so relatively inexpensive at £10 for 500g (note relative to other brands).
On reading the label it told me what I got if I mixed it with water.
then it told me what I got if I mixed it with milk.
Basically the nutritional elements doubled if I drank it mixed with milk.
Which leads to one simple conclusion.
Post race energy sports drink is just milk powder.
So I checked against a carton of Marvel milk powder (maybe £2 from Tesco) and Tesco's own - even cheaper.
Theory confirmed.
So for a post race energy sports drink save yourself a fortune and buy own brand milk powder, or, if you prefer, have a pint of milk, which is much nicer