After cremation of an adult, approximately 1-1.5 kg of ash remains, so you have to spend about $1.8 million to fly into space "entirely". You are right it is only for the selected few even today.

I already the aliens far far away taking the bodies and eating them as snacks or hanging them on their space walls as a trophy hahha.

Probably they can not wait until we start sending the whole bodies :)