This time last month, a near-mint non-foil copy of Tyvar the Bellicose would have set you back $3.27
Some useful external cards include: "Treasure Panther" (and to a lesser extent "WAKE CUP

Sort Card Type Dark Omanyte #37Uncommon $5.18 Helix Fossil Omanyte #102Uncommon $0.19 Helix Fossil Omanyte #69Common Omanyte #70Common $0.36 Omanyte #52Common $0.71 Omanyte #60Common $2.29 Omanyte #57Uncommon $2.07 Omanyte #41Uncommon $22.99 Omanyte #70Common $1.24 Omanyte #60Common $23.63 Omanyte #56Common $0.80 Omanyte #69Common $0.70 Omanyte #17Uncommon $0.33 Omanyte #75Uncommon $0.30 Omanyte #56Uncommon $0.80 Omanyte #15Common $2.00 Omanyte - 138/165 #138Uncommon $0.17 Omanyte - 138/165 #138Uncommon $0.12 Omanyte - 138/165 (Master Ball Pattern) #138Uncommon $10.74 Omanyte - 138/165 (Poke Ball Pattern) #138Uncommon $0.60 Omanyte - 180/165 #180Illustration Rare $14.39 Omanyte - 180/165 #180Art Rare $3.57 Omanyte (Delta Species) #74Common $0.92 Omanyte #60Common $23.63 Omanyte #41Uncommon $22.99 Omanyte - 180/165 #180Illustration Rare $14.39 Omanyte - 138/165 (Master Ball Pattern) #138Uncommon $10.74 Dark Omanyte #37Uncommon $5.18 Omanyte - 180/165 #180Art Rare $3.57 Omanyte #60Common $2.29 Omanyte #57Uncommon $2.07 Omanyte #15Common $2.00 Omanyte #70Common $1.24

If thats the case, then you might want to add more sources of card advantage
Whether you prefer Fire or Ice, each of these promo cards is a must-have for any Pikachu lover
And to be honest, I just found it quite enjoyable to expand my collection continuously, and don't consider it to be monetised in an overly blatant way, nor disturbing in the way it's structured