A "pure devotee of Krishna" is not interested in taking birth in wealthy and pious families on this planet, or going to the material heavenly planets, nor are they interested in even entering the eternal youthful Vaikuntha planet's of Lord Vishnu in the Spiritual World. They are ONLY interested in Krishna in Goloka Vrindavana.

A pure devotee of Krishna is not interested in the material heavenly planets nor are they interested in even the Vaikuntha planets of Lord Vishnu in the Spiritual World.

"Pure devotees of Krishna" are ONLY interested in going back to Goloka Vrindavan, the central abode in the Spiritual Sky. 

Srila Prabhupada - "You have inquired about how we leave our material body and enter into the Spiritual Sky. 

This information is very nicely explained in the Second Canto of Srimad-Bhagavatam, First Chapter. 

The idea is that this material universe is just like a coconut fruit, and exactly like the coconut fruit there is a covering of several material layers. 

Each layer is said to be ten times more thicker than the previous layer. 

So when a living entity is eligible and fully prepared to enter into the Spiritual Sky, he merges his different bodily elements  which are called earth, fire, water, air, and ether. 

In those coverings of material layers, the bodily elements return, and the living entity goes back to the Spiritual Sky. 

Pure devotees do not desire to enter into any one of the higher material planetary systems of this universe. 

Sometimes mystic yogis are interested to see the higher planetary systems, and before entering into the Spiritual Sky, they take advantage of seeing the higher planetary systems. 

But a pure devotee is so much eager to enter back into the Spiritual Sky, especially devotees of Krishna, so they do not try even to enter into the Vaikuntha Lokas. 

Everything depends on the intense desire of the living entity, and Krishna gives all facilities for fulfilling such desires. 

So far as we are concerned, we should always be very much eager to directly contact Krishna, following the Footprints of Lord Caitanya. (Letter to Vrndavanesvari -- Allston, Mass 26 April, 1969)