less cheap than or cheaper than

[Maylee]

Hi,
Is the sentence below grammatically correct?
Strawberries are less cheap than oranges.

Recently, I've been confused by the following sentence patterns:
A + be + Adj-er/more Adj+ than + B
→ B + be + less Adj + than + A
→ B + be + not + as Adj as + A
Example:
Oranges are cheaper than strawberries.
→ Strawberries are less cheap than oranges.
→ Strawberries are not as cheap as oranges.

As we know, 'cheaper' is the comparative of "cheap."
So, should we use the pattern "less cheap than"?

May I change the second sentence to:
Strawberries are more expensive than oranges.


As for the above-mentioned patterns, sentences like these would be no problem:
Health is more important than wealth.
→ Wealth is less important than health.
→ Wealth is not as important as health.

But, the use of "less cheap" is confusing me.

[mandrews]

If a comparative word exists, then it should be used.

'Cheaper' is correct, 'less cheap' is somewhat strange.

There is no comparative word for 'expensive' that is why we use 'more/less expensive'