4. How much money did you spend on the rig as it is right now?

Here in Brasil, everything is very expensive now due to a local financial and political crisis that has been around since 2014.
This project was around R$15000 (roughly 4100 USD).

5. How often do you update/buy a new rig?

Whenever I feel I need more power.

6. What components are used?

Specs

• I7 7700K 
• Asus Maximus IX Formula
• 32Gb Gskill TridentZ RGB 3000Mhz
• GTX 1080Ti Founders Edition
• Samsung 960 EVO 500Gb
• EVGA 850W Gold Modular power supply
• Thermaltake Core P3 White Edition

Watercooling:

• Custom made Reservoir, made here at my store.
• EK DDC 3.2 Pwm Pump with EK Top
• EK Supremacy Evo Nickel - Plexi Top
• Ek FC Geforce GTX FE Nickel waterBlock for GPU
• XSPC EX360 Crossflow Radiador + 3 Corsair SP120 RGB Fans
• EK HD adapter 12mmFittings
• 12mm rigid plexi tubing
• Pó de diamante Cristal Fluid

Accessories:

• Front Cover, TOP Cover and BackCover with 1X120mm fan support custom made here at my store (to protect it from dust)
• One RAIDMAX RGB PWM fan at the back, pretty awesome fans... far better than the Corsair ones!
• White Themed PSU Cover
• RGB Strip made at VGA base to light it up
• Naja Sleeving from TitanCaseLabs